1200A 600VAC Class L Fast-Acting Non-Renewable Bolt-On Power Fuse, Amp-Trap Monolithic Industrial Safety Protection Series, 200,000A Interrupting Sinking Capacity Breaking Threshold, High-Conductivity Heavy-Duty Silver-Plated Copper Contact Blades, Rigid Moisture-Resistant Melamine or Fiber Tubing Enclosure Shell, Core Overcurrent and Severe Short-Circuit Thermal Safety Barrier, Code-Compliant Industrial Branch Circuit Disconnect Protection, High Stability Main Switchboard Power Node | High-performance industrial-grade non-renewable fast-acting bolt-on power fuse manufactured by Ferraz Shawmut (now Mersen) under legacy catalog ordering reference A4BY1200. Engineered exclusively to protect high-capacity structural conduits and massive plant distribution hubs, this large-scale 1200-Amp Class L bolt-mount device provides extreme low-resistance overcurrent screening. It absorbs extreme operational mechanical stresses and continuous multi-phase thermal expansions safely without parameter drift, blocking upstream supply variations from corrupting downstream production loops and safely clearing catastrophic short circuits up to 200,000 Amps. | Industry Exact Equivalents: Ferraz Shawmut A4BY1200, Mersen A4BY1200, Gould A4BY1200, Bussmann KLU-1200, Littelfuse KLPC1200, Edison LCL1200 | Industry Functional Cross-References:Class L Bolt-On Fuses, Class L 1200A Fuses, 600V 1200A Bolt-Mount Fuses, Mersen A4BY Series | Military Specification National Stock Number (NSN): 5920-00-142-9307 (Base Class L Bolt-Mount Power Fuse Matrix)
